Fix compilation on MacOS X

* src/util/virfile.h: the virFileWrapperFdFlags being defined as
  a globa variable instead of a type ended up generating a duplicate
  symbol error.
* AUTHORS: added Lincoln Myers

AUTHORS

@@ -220,6 +220,7 @@ Patches have also been contributed by:
   Ansis Atteka         <aatteka@nicira.com>
   Dan Wendlandt        <dan@nicira.com>
   Kyle Mestery         <kmestery@cisco.com>
+  Lincoln Myers        <lincoln_myers@yahoo.com>
 
   [....send patches to get your name here....]
 

src/util/virfile.h

@@ -58,10 +58,10 @@ typedef virFileWrapperFd *virFileWrapperFdPtr;
 
 int virFileDirectFdFlag(void);
 
-enum {
+enum virFileWrapperFdFlags {
     VIR_FILE_WRAPPER_BYPASS_CACHE   = (1 << 0),
     VIR_FILE_WRAPPER_NON_BLOCKING   = (1 << 1),
-} virFileWrapperFdFlags;
+};
 
 virFileWrapperFdPtr virFileWrapperFdNew(int *fd,
                                         const char *name,